Welcome to Trouble Free Pool

We would like to welcome you to TFP, the webs leading Pool related website. We invite you to please Register to create a new account. Doing this will give you full access to the forums, where you will be able to receive personalized advice concerning your pool. We hope to see you soon!

After the rain my balance went bye-bye

Hi All,
I'm not going to get too excited yet but we had a rain storm that dropped about 2 inched on Monday. I had to lower the pool about the same 2". Last Saturday I added about 16 oz of liquid muratic acid 29% to try an lower my TA from 140 down to about 80 to prepare for the salt that will be added in about a week.

Last Saturdays readings
FC 5
TC 5
ph 7.6
TA 140
CA 250
CYA 100

Todays readings
FC 5
TC 5
ph 7.2
TA 80
CA 250
CYA 100

As per the pool calculators direction to lower TA you should use muratic acid and ph will also come down and you need aeration to bring the ph back up.

Yes, aeration will raise PH without increasing TA. You can use a fountain, spa jets, rain, kids splashing, an air compressor, etc. to provide the aeration.

I am concerned that there might be problems with the water testing numbers. It would take over a gallon of muriatic acid to lower the TA as much as you describe in 11,500 gallons. How are you getting the water test results? (Pool store or specific brand/model of test kit) Another thing to keep in mind: It is best not to allow the PH to go below 7.0. If the TA really went down that much the PH must have been far lower right after you added the acid (the rain would have increased it). Low PH can damage metal plumbing parts, especially copper heat exchanger coils in pool heaters.

Jason,
You are absolutly correct that 1 gal of muratic acid total over the past 6 days. Any I just double checked the numbers at the local Leslie's pool and they are good.
I tested the ph with my kit and ph was low but Leslie's Pools says it is 7.2
I have a aquachem pro kit which has been accurate as well as test strips.
I did get the Alk down to 80 which I wanted now we will run the waterfall and aerater to bring the ph up a little.

I can just imagion when we add the salt in a week or so what will happen to ph and alk.
I suspect both will rise.
Iggy

No need to worry about the testing then. You mentioned 16 oz of acid and I knew that couldn't be right. Also, before you edited the post some of the other numbers were off, but now that you have corrected them and clarified the amount of acid it all makes sense.

If you added the acid in batches slowly over the week while tracking the PH then you are doing exactly the right thing.

No need to worry about the testing then. You mentioned 16 oz of acid and I knew that couldn't be right. Also, before you edited the post some of the other numbers were off, but now that you have corrected them and clarified the amount of acid it all makes sense.

If you added the acid in batches slowly over the week while tracking the PH then you are doing exactly the right thing.

Thank you for your helpful words.
Yes I did get back and edited the original post after I noticed a few errors.
I think I know what I'm doing but I still need reassurances from the experts.
I just consider myself very dangerious with the chemistry knowledge I have learned lately.
I think my wife is scared to go in the pool thinking her hair will turn blue or all fall out. LOL

Hi Neighbor

8) Hi cliff_s

We probably use the same Leslie's Pool place to check pur pool water (Reems/Grand)
Sometimes I like my reading better than theirs. I usually double check with my liquid kit as well as my test strips.
They just told me that my pH was 8 today and FC 1.5. I checked myself and it was pH 7.6 and FC 2.5
Oh well this is a continues learning process for me but I do feel confident in my readings.